Elevator safety device



A. w. BLEYLE AND I. J. DAVIS.

, ELEVATOR SAFETY DEVICE.

APPLICATION FILED MAY I2, 192i.

ff'. I

UNITED stares FAiENT OFFICE.

AUGUST w. ELEYLE, oF EERREEEY, AND roiaiv J. DAVIS, CFCAKLAND CALIFORNIAi n y Ay,

AsSiGNoRs 'ro ii. WARE DAWSON,

CF SAN FRANCISCO, CALIFORNIA.

ELEVATCR SAFETY DEVICE.

To @ZZ whom t may con-cem Be it known that we, AUGUSTl XF. BLEYLE andJOHN J. DAvis, citizens ofI the United States, residing at Berkeley andOakland, respectively, in the county of Alameda and State of California,have invented certain new and useful Improvements in Elevator SafetyDevices, of which the following is a specification. l

This invention relates to an elevator safety device, and moreparticularly to a simple construction adapted for manufactureandinstallation at little cost, and by the use of which an elevator isprevented from being operated until such-time as the elevator doors arein closed position.

By the present invention, the elevator operator is unable `to completethe elevator operating circuit until such 'time as the door latch is inlocked position assuring the closing ofthe door, and precluding theopening thereof.

An object of the invention is to provide, among other things, aparticular form of switch lever which is positively operated to ayposition to break the elevator controlling vcircuit by the releasingmovement of the door controlling latch bolt thereby precluding theaccidentalmaintaining of the circuit at suchtime as the elevator door isopened.

A. further Objectis to provide a construction wherein the latch bolt andswitch lever are so constructed as to contain little metal and to be ofvery light weight, and which when in co-operative relation will have apositive interlock which insures the manual operation of the switchlever bythe pivotal movement 'of the latch bolt in either dierection.

A further object is to incorporate a spring contact in connection withthe switch lever for completing the elevator control circuit kwhereby apositive 'Contact between the stationary Contact members within theelevator circuit line will 'be maintained.

With the above mentioned and other 'objects in view, the inventionconsists in the novel construction and combination of parts hereinafterdescribed, illustrated in the accompanying drawings, and set forth intheclaims hereto appended, it being understood that various changes inthefform, proportion, size `and minor details of construction within thescope of the claims maybe rey Specification of Letters Batent.

Patented 15.11134,l 1922.

i921. seriai No. 468,904.

sorted "to without departing from the spirit or. sacrificing any of theadvantages of the invention.

To more fully comprehend the invention, reference is directed to theaccompanying drawings, wherein :e Y

Figure l is a view in elevation of the preferred embodiment ofourinvention illustrated with the elevator door in Vopen position.

Figure 2 is a view in end elevation taken on line 2-2 of Figure l.

Figure 3 is a view similar to Figure l with the elevator door in closedposition.

Figure 4 is a sectional view taken on line 41E-e4; Figure 8, viewed inthe direction of the arrow. f l

Figure 5 is a vertical sectional view taken i o n line 5*-5 of Figure 3illustrating the vertical slot within the Vswitch lever, and the latchguiding tongue.V l*

Figure 6 is a view in front elevation of the lock casing. 1.Figure 7 isa sectional view on line 7-7 Figure 3 disclosing the stationaryContacts. Figure 8 is a view in perspective of the switch lever, and

Figure 9 is an inverted perspective view of the latch' bolt illustratingthe vguiding tongue. i

Referring more particularly to the several views of the drawings whereinlike charac ters of referencev designate corresponding parts, l is adoor casing, and 2 is a door frame carrying one or more supportingwheels 3 which operate on the supporting door rail 4r. The door frame ismoved loiigitudinally of the rail l in any suitable manner toand fromthecasing 1.V Secured to the Casing l isa suitable lock case 5'. theouter face of which is open andis adapted to be closed by a removablecover plate 6 detachably secured thereto by screws or other means 7. Thecasing front wallfacing the 'door frame is at its lower end formed vitha latch bolt receiving openingS, and the upper wall surface ofsaidopeningis inwardly turned forming a latch bolt head engaging part 9Figures land Q of thedrawings. Secured to the inner face of the'upperwall surface of the case 5 is a piece of suitable insulating materialA10 carrying on its under face the spaced statitonary contacts ll fromwhich lead the wires l2 forming the elevator'operating Circuit. :Thecontacts `is `moved to closed position. The lever 16 is at its rearendmounted to swing on ahorizontal fulcrum 18 adjacent the rear wall ofthe lockcase 1, and the enlarged forward end of said lever is adapted tofall by gravity in `rear of the case opening Sand adjacent said openingis transversely slotted as at 19 forming the upper and lower furcations20 and 21, between which is adapted to be received `the enlarged head ofa suit-able latch bolt hereinafter described. The lower furcation isvertically slotted inwardly from its free end, as at 22,affordingparallel fingers 23 providing a guide for the hereinafterdescribed la'tch bolt. The extreme forward end y of the upper edge ofthe lever 16 isprovided with a stop 24`for resting on the upper surfaceof the part 9 when. the free end of the lever 16 is in open position, asin Figure 1.

Pivotally mounted within its length at the Aforward end of the doorframe 2 to swing on a horizontal fulcrum 24 is a latch bolt 25, the rearend of which is pivotally connected as at 26 to a vertically movablebolt operating rod ormember 27. The rod 27 is adapted to be raised inthe direction of thearrow, Figure 3, in any suitable manner, either bythe vehicle operator, orautomatically when it is desired to release thelatch bolt 25, and the weight of the member 27 normally maintains thefree forward end of the latch bolt 25 in its raised position, as

in Figures 1 and 2 of the drawings.` The forward end of the latch bolt25, which extends beyond the door frame 2, is adapted to be projectedthrough the casing opening 8 on the closing of the door, as illustratedin Figure 3, and said free end is provided with the1 upwardly yextending latch head 28 formed with a locking face 29 adapted to engagein rear of the substantially vertical face or surface 30 of the part 9.0n its under surface, the free end of the latch bolt 25 is cutawayinwardly on opposite sides :from its outer end, as at 31, forming alongitudinal guiding tongue 32 adapted for reception within the verticalslot 22 in the approximately equal to the distance between adjacentsurfaces of the furcations 20 and 21.

whereby the latch head when projected through, the opening 8 will bereceived Ain the transverse slot 19 and will occupy approximately all ofthe space Aafforded thereby, whereby the weight of the latch operatingmember, in causing the free end of the latch bolt to move upwardly, willcause a positive operation of the lever 16. Under normal conditions, thedownward movement of the latch head 28 by u ward movement of the member27 releases t e pressure against the turc-ation 20, and'permits the sameto drop by gravity breaking the contact between the members 13 and 11,but should said contacts for any reason freeze and preclude the droppingby gravit ofthe lever 16, the positive movement o the Vhead 28downwardly to enable the surface 29 thereof to clear the face 30 of theopening 8, `would cause the under cut portions 31 of the latch tocontact with the lingers 23 and positively force the free end of theswitch lever 16 downwardly to break the elevator operating circuit priorto such time as it would be possible to open the elevator door. Byforming the guiding tongue 32 on the under surface of the free end ofthe latch bolt 25, and by providing the slot 22 in the lower furcation21 of the lever 16, the guiding of the latch bolt in its proper positiontransversely of the lever is at all times assured and the operativemovement of the free end of latch bolt is reduced to a vminimum toobtain the required movement of the lever 16.

Having thus described our invention what we claim as new and desire tosecure by Letters Patent of the United States is 1. A safety lock forelevator shaft doors comprisinga lock case fixed to the door casing andprovided with a latch bolt receiving opening in one wall thereof, ahorizonta ly fulcrumed headedV latch bolt carried by the door to movelongitudinally therewith to be projected through the case opening andinterlock withthe wall thereof, a switch lever pivotally mounted at itsrear end within the lock `case and with itsy Vforward end facing saidcase openingl and adapted to drop by gravity to a point in rear of saidopeningythe forward end` of said leverhaving a transverse slot affordingupper vand lower parallel furcations between which said headed latchbolt is adapted to snuglyY fit on the insertion of the same within thelatch bolt receiving opening whereby said lever is positively operatedon its fulcrum by the swinging movement of said latch bolt, a stop onthe lever, a part on the lockcase with which said stopxcontacts to limitthe downward swinging movement of the lever, a pair of stationarycontacts, a contactlcarried by the lever and adapted to complete thecircuit between saidstationary contacts, and means Vfor normally`forcing the headed end of the latch upwardlyand to overbalance theweight of the lever whereby on the reception of said latch head withinSaid case opening, said lever is automatically and positively operatedto make said contacts, and whereby on the lowering of said latch saidlever is positively operated to break said contacts should the switchlever fail to drop by gravity.

2. A safety lock for elevator shaft doors comprising a lock case fixedto the door casing and provided with a latch bolt receiving opening inone wall thereof, a horizontally fulcrumed headed latch bolt carried bythe door to move longitudinally therewith to be projected through thecase opening and interlock with the wall thereof, said latch being cutaway at opposite sides of its under face affording parallel shouldersforming a longitudinal guiding tongue between them, a switch leverpivotally mounted at its rear end within the lock case and with itsforward end facing said case opening and adapted to drop by gravity to apoint in rear of said opening, the forward end of said lever having atransverse slot affording upper and lower parallel furcations betweenwhich said headed latch bolt is adapted t0 snugly t on the insertion ofthe same within the latch bolt receiving opening whereby said lever ispositively operated on its ful? crum, by the swinging movement of saidlatch bolt7 the lower furcation being vertically slotted inwardly fromits free end affording parallel fingers between which said latch guidingtongue is received and on which said shoulders bear, a' stop on thelever a part on the lock case with which said stop contacts to limit thedownward swinging movement of the lever, a pair of stationary contacts,a contact carried by the lever and adapted to complete the circuitbetween said stationary contacts, yand means for normally forcing theheaded end of the latch upwardly and to overbalance the weight of thelever whereby on the reception of said latch head within said caseopening, said lever is automatically and positively operated to makesaid contacts, and whereby on the lowering of said latch said lever ispositively operated to break said contacts should the switch lever failto drop by gravity. Y

In testimony whereof we have signed our naines to this specification.

AUGUST W. BLEYLE. JOHN J. DAVIS. Y

